公开(公告)号：HU907112D0

公开(公告)日：1991-05-28

申请号：HU711290

申请日：1990-11-13

Applicant: HOECHST AG

Inventor： FREYER WALTER ,  MILTENBERGER KARLHEINZ ,  SCHMIDT MANFRED

IPC: B01J31/02 ,  C07B61/00 ,  C07C51/62 ,  C07C53/48

公开(公告)号：HUT54965A

公开(公告)日：1991-04-29

申请号：HU634690

申请日：1990-10-05

Applicant: HOECHST AG

Inventor： FREYER WALTER ,  MILTENBERGER KARLHEINZ ,  SCHMIDT MANFRED

IPC: C07C51/58 ,  C07C53/48

Abstract: In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone. The reaction time for achieving a certain conversion is in this way reduced. In the preparation of DAC, a constant content of acid chloride is established in the reaction mixture by removing some of the mixture and working this up by distillation, while the circulating reaction mixture is simultaneously topped up with fresh trichloroethene. In this way, side reactions are suppressed and the amount of by-products is reduced.

公开(公告)号：DK0513055T3

公开(公告)日：1995-02-13

申请号：DK91902698

申请日：1991-01-24

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ

IPC: C07C51/04 ,  C07C53/16 ,  C07C67/14 ,  C07C69/63

公开(公告)号：ES2063489T3

公开(公告)日：1995-01-01

申请号：ES91902698

申请日：1991-01-24

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ

IPC: C07C51/04 ,  C07C53/16 ,  C07C67/14 ,  C07C69/63

公开(公告)号：HU209824B

公开(公告)日：1994-11-28

申请号：HU634690

申请日：1990-10-05

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ ,  FREYER WALTER ,  SCHMIDT MANFRED

IPC: C07C51/58 ,  C07C53/48 ,  C07C51/25

Abstract: In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone. The reaction time for achieving a certain conversion is in this way reduced. In the preparation of DAC, a constant content of acid chloride is established in the reaction mixture by removing some of the mixture and working this up by distillation, while the circulating reaction mixture is simultaneously topped up with fresh trichloroethene. In this way, side reactions are suppressed and the amount of by-products is reduced.

公开(公告)号：DE59102848D1

公开(公告)日：1994-10-13

申请号：DE59102848

申请日：1991-01-24

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ

IPC: C07C51/04 ,  C07C53/16 ,  C07C67/14 ,  C07C69/63

公开(公告)号：HU208299B

公开(公告)日：1993-09-28

申请号：HU250392

申请日：1991-01-24

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ

IPC: C07C51/04 ,  C07C53/16 ,  C07C67/14 ,  C07C69/63

公开(公告)号：HUT55743A

公开(公告)日：1991-06-28

申请号：HU711290

申请日：1990-11-13

Applicant: HOECHST AG

Inventor： FREYER WALTER ,  MILTENBERGER KARLHEINZ ,  SCHMIDT MANFRED

IPC: B01J31/02 ,  C07B61/00 ,  C07C51/62 ,  C07C53/48

公开(公告)号：HU906533D0

公开(公告)日：1991-04-29

申请号：HU653390

申请日：1990-10-24

Applicant: HOECHST AG

Inventor： MILTENBERGER KARLHEINZ ,  SCHMIDT MANFRED ,  PETZ KARL

IPC: B01J27/053 ,  B01J27/125 ,  B01J31/02 ,  C07B61/00 ,  C07C67/08 ,  C07C67/54 ,  C07C67/58 ,  C07C69/02 ,  C07C69/63

Abstract: In the esterification of aliphatic C2-C6-carboxylic acids with aliphatic C1-C4-alcohols, the ester formed is distilled off azeotropically together with the water of reaction. After being separated from the water of reaction in a separation cooler, the ester phase is freed from entrained acid by scrubbing with water, and water and alcohol are then removed by distilling off a small portion of the ester. In this manner, no salt-containing waste water is formed. The ester is obtained in very good yield and free of acid and alcohol.

公开(公告)号：HU906346D0

公开(公告)日：1991-04-29

申请号：HU634690

申请日：1990-10-05

Applicant: HOECHST AG

Inventor： FREYER WALTER ,  MILTENBERGER KARLHEINZ ,  SCHMIDT MANFRED

IPC: C07C51/58 ,  C07C53/48

Abstract: In the conversion of trichloroethene and tetrachloroethene into dichloroacetyl chloride (DAC) or trichloroacetyl chloride (TAC) by means of oxygen, the reaction mixture is passed several times as a thin film through the reaction zone. The reaction time for achieving a certain conversion is in this way reduced. In the preparation of DAC, a constant content of acid chloride is established in the reaction mixture by removing some of the mixture and working this up by distillation, while the circulating reaction mixture is simultaneously topped up with fresh trichloroethene. In this way, side reactions are suppressed and the amount of by-products is reduced.